Unitary cavity spin squeezing by quantum erasure

Author(s)
Leroux, Ian Daniel; Schleier-Smith, Monika Helene; Zhang, Hao; Vuletic, Vladan
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Abstract
Deterministic light-induced spin squeezing in an atomic gas is limited by photon shot noise or, equivalently, by atomic state information escaping with the light field mediating the effective atom-atom interaction. We show theoretically that the performance of cavity spin squeezing [ M. H. Schleier-Smith, I. D. Leroux and V. Vuletić Phys. Rev. A 81 021804 (2010)] can be substantially improved by erasing the light-atom entanglement, and propose several methods for doing so. Accounting for light scattering into free space, quantum erasure improves the scaling of cavity squeezing from S[superscript −1/2] to S[superscript −2/3], where S is the total atomic spin.
Date issued
2012-01
URI
http://hdl.handle.net/1721.1/69565
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Research Laboratory of Electronics; MIT-Harvard Center for Ultracold Atoms
Journal
Physical Review A
Publisher
American Physical Society (APS)
Citation
Leroux, Ian et al. “Unitary Cavity Spin Squeezing by Quantum Erasure.” Physical Review A 85.1 (2012): n. pag. Web. 2 Mar. 2012. © 2011 American Physical Society
Version: Final published version
ISSN
1050-2947
1094-1622
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